Mere Christianity,

C.S. Lewis

The Divine Conspiracy,

Dallas Willard

The Cost of Discipleship,

Dietrich Bonhoeffer

The Pursuit of God,

A.W. Tozer

The Purpose Driven Life,

Rick Warren

The Reason for God,

Timothy Keller

Pilgrim's Progress,

John Bunyan

Orthodoxy,

G.K. Chesterton

The 7 Habits of Highly Effective People,

Stephen R. Covey

Knowing God,

J.I. Packer